Yamaha FZS1000N, Service Manual

Page: 268 / 394

5-65
CRANKCASE
ENG
NOTE:
c. Measure piston skirt diameter “P” with the
micrometer.
a
5 mm (0.20 in) from the bottom edge of the piston.
Piston size “P”
73.955
X
73.970 mm
(2.9118
X
2.9122 in)
d. If out of specification, replace the piston and
piston rings as a set.
e. Calculate the piston-to-cylinder clearance
with the following formula.
Piston-to-cylinder clearance =
Cylinder bore “C” –
Piston skirt diameter “P”
Piston-to-cylinder clearance
0.030
X
0.055 mm
(0.001
X
0.002 in)
<Limit>: 0.12 mm (0.005 in)
f. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
EAS00263
CHECKING THE PISTON RINGS
1. Measure:
piston ring side clearance
Out of specification
!
Replace the piston
and piston rings as a set.
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston ring side clearance
Top ring
0.030
X
0.065 mm
(0.0012
X
0.0026 in)
2nd ring
0.020
X
0.055 mm
(0.0008
X
0.0022 in)